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Re: [PATCH] x86/MCE-telem: adjust cookie definition
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 19 Feb 2025 11:50:46 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <stefano@xxxxxxxxxxxxxx>, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 19 Feb 2025 10:50:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.02.2025 11:44, Andrew Cooper wrote:
> On 19/02/2025 10:00 am, Jan Beulich wrote:
>> struct mctelem_ent is opaque outside of mcetelem.c; the cookie
>> abstraction exists - afaict - just to achieve this opaqueness. Then it
>> is irrelevant though which kind of pointer mctelem_cookie_t resolves to.
>> IOW we can as well use struct mctelem_ent there, allowing to remove the
>> casts from COOKIE2MCTE() and MCTE2COOKIE(). Their removal addresses
>> Misra C:2012 rule 11.2 ("Conversions shall not be performed between a
>> pointer to an incomplete type and any other type") violations.
>>
>> No functional change intended.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> https://gitlab.com/xen-project/people/andyhhp/xen/-/jobs/9181587757
>
> Eclair does appear to be happy with this approach (assuming I stripped
> down to only checking R11.2 correctly, and making it fatal).
>
> For the change itself, it's an almost identical binary, differing only
> in the string section which I expect means some embedded line numbers.
Line number changes would be odd, given the patch doesn't add or remove
any lines. I expect its internal kind-of-sequence numbers of the compiler,
used to e.g. generate local label names.
> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Thanks.
Jan
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